Just a few thoughts
With the foundation as is, I would think you would have to use a landing to turn the steps from the house towards the garage doors to keep from blocking the walk through door at the back.(taking away floor space )
My suggestion would be to raise the floor of your garage...
https://www.purplewave.com/auction/170118?page=1&zipcodeRange=all&filters=family_category_id%3A641&sortBy=current_bid-desc&perPage=50&viewtype=compressed
Tool bench,72"tool box and lift are all from Canada west supply.
Thanks